Warm-air furnace



June 26, 1928.

0. P. NYSTROM WARM AIR FURNACE Filed 001;. 24, 1927 INVANTOR I BY 05m AM sfrom q A TTORNEYS Patented June 26, 1928.-

osoAn r. nys'rnoivr. or H0 a feed door ily adjusted in place so that thedoor shall accurately fit theflange of the door opening.

Objects pertaining to details and cc on o mies of my from thedescription to follow.

I accomplish the objects of my invention by the devi followingspecification. The invention is clearly defined and pointed out in'theclaims.-

A device clearly illustrated" in the accompanying drawing forming a partof this application,

in which:

'F1g. 1s a casting'of the furnace with my improved feed door structure111' place. I

Fig. 2 is door frame Fig. 3 1s Fig. 4 is a detail-view in section takenon line l-4 of Figs. 3 and 5, the section being through the retainingbolts.

Fig. 5 is an enlarged detail sectional view on line of the adjustingclamping bolts.

- Fig. 6 is an enlargeddetail sectionalview on line 6.6 of Figs. 2, 3and 4: through one of the adjusting set screws. I 3 v j The parts willbe identified by their numerals of re I the views.

1 isthe fire pot ofthe furnace. 2 is the combustion passage terminatingin the door opening t which presents preferably a ground joint surfaceat the front. The furnace casting forming the central upward anddownward projecting lugs 5 and slotted lugs '6 at each side: above andbelow the door opening for attachment and adjustment of the door frame.7 is-the door frame ITED STATES PATENr OFFICE. I

LLAND, MICHIGAN, Assrenon T0 no LnnnrUnNAcE coir:-

, PANY HOLLAND, MICHIGAN.

' WARM-AIRFURNA CE;

' Application filed October 24 1.927. Serial No. 228,292. I

' provide construction which can-be readinvention will definitely appearces and means described in the embodying m inventionis perspective viewof the main an enlarged detail plan view of of Figs. 2; 3'and t throughone ferencewhich are the samein all chamber. 3 is the feed intake intakepassage is 'n'o'videdfwith my hand.

on which is hinged the door 8. I

9 is the,doorlatchcarried by'the door frame. 61, 61 are the attachingbolts for. the door frame, one at each side, being v disposed throughtheframe 7 and the slotted lugs 6. '51 are the adjustin set screws throughnuts '52 for adjusti'i'ig accurately the position of]! the door frame;in cooperation with the at taching bolts 61.

From this it w1ll be seen that the door 7 withits ground face tocorrespond with the I ground joint of the door opening in-the castingcan be effectively and accurately ad' justed in place before the jointsarecemented. This is done by putting the door in place; adjusting theset screws 51 and draw-v ing up the attaching bolts and adjusting saidbolts and screws until the desired result is attained. The joints aboutthe. frame can then be cemented or packed desired.

Having thus described my invention what I claim as new and desire toLetters Patent is:

1. In a furnace door-structure, acoinbustion chamber casting with feedpassage. a door opening therefor with'gli'ound joint, central lugs andlateral slotted lugs above and below said door opening a'door frame doorhinged thereto witlrground joint; clamping boltsv disposed through thelateral slottedlugs, and a central set screwcooperating therewith foradjustmentof the same, as specified. I i v i i 2/In a furnace doorstructure, the combination of a combustion ,chambercasting with a dooropening with ground joint surface [at the front,a door frame with groundjoint surface corresponding to said ground joint surface at the front"of said combustion chamber and adapted to cooperate there-' with.means'to adjustably attach said frame comprising lateral clamp bolts andintermediate set screws. and a door hinged t S d door frame. asspecified.

In witness whereof secure by I i have hereunto set

